Sounds like a good combo.
The unequal length headers will be easier to install. I have a set of BBK equal length headers (Ceramic coated) and they were a PTA to install. However, if you follow the directions and jack-up one side of the engine, they will go in. Just takes some patience. The ceramic coating is nice. I've had mine for 4 years or so with no problems...except that I scratched them up pretty good during the install (tough not too
)
Unless you're building a real mean 302, I don't think the unequal lengths will hurt power that much at all.
Good luck,
E
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1991 5.0 LX Coupe - 38,000 miles
13.17 @ 106.14 mph w/ 2.138 60'